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Income Taxes (Reconciliation of the Federal Statutory and Effective Income Tax Rate) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Income (loss) from continuing operations before income tax provision (benefit) $ (76,573,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 55,720,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 58,028,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Statutory taxes (benefit) at 35.0% (26,801,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 19,502,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 20,310,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State and local income taxes (7,112,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 136,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 1,568,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
NACoal valuation allowance 5,742,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (12,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Non-deductible expenses 632,000us-gaap_IncomeTaxReconciliationNondeductibleExpense 1,081,000us-gaap_IncomeTaxReconciliationNondeductibleExpense 1,112,000us-gaap_IncomeTaxReconciliationNondeductibleExpense
Percentage depletion (8,572,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion (8,057,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion (4,963,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion
R&D and other federal credits (1,397,000)nacco_IncomeTaxReconciliationResearchAndDevelopmentAndOtherFederalCredits (1,173,000)nacco_IncomeTaxReconciliationResearchAndDevelopmentAndOtherFederalCredits (132,000)nacco_IncomeTaxReconciliationResearchAndDevelopmentAndOtherFederalCredits
Other, net 322,000us-gaap_IncomeTaxReconciliationOtherAdjustments 520,000us-gaap_IncomeTaxReconciliationOtherAdjustments (1,629,000)us-gaap_IncomeTaxReconciliationOtherAdjustments
Tax settlements (1,269,000)us-gaap_IncomeTaxReconciliationTaxSettlements (727,000)us-gaap_IncomeTaxReconciliationTaxSettlements (401,000)us-gaap_IncomeTaxReconciliationTaxSettlements
Income tax provision (38,455,000)us-gaap_IncomeTaxExpenseBenefit 11,270,000us-gaap_IncomeTaxExpenseBenefit 15,865,000us-gaap_IncomeTaxExpenseBenefit
Effective income tax rate 50.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 20.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 27.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Statutory tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Cumulative unremitted earnings of foreign subsidiaries 8,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Cumulative deferred tax liabilities of unremitted foreign earnings $ 223,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings $ 168,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings